rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P10288/1:b..l P10345/1:b..l
rcu: (detected by 1, t=10502 jiffies, g=207657, q=240 ncpus=2)
task:modprobe state:R running task stack:25464 pid:10345 tgid:10345 ppid:25171 task_flags:0x40000c flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6786
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109
irqentry_exit+0x36/0x90 kernel/entry/common.c:307
asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:707
RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5875
Code: 55 37 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 f2 b2 10 0f 0f 82 74 02 00 00 8b 35 da e4 10 0f 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 89 55 37 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0018:ffffc90004c97710 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e5c4e00 RCX: 00000000f9d20bc7
RDX: 0000000000000000 RSI: ffffffff8de0a75d RDI: ffffffff8c157260
RBP: 0000000000000002 R08: 3785cb76049c6930 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:905 [inline]
slab_free_hook mm/slub.c:2333 [inline]
slab_free mm/slub.c:4643 [inline]
kmem_cache_free+0x142/0x4d0 mm/slub.c:4745
exit_mmap+0x511/0xb90 mm/mmap.c:1309
__mmput+0x12a/0x410 kernel/fork.c:1121
mmput+0x62/0x70 kernel/fork.c:1144
exit_mm kernel/exit.c:581 [inline]
do_exit+0x7c4/0x2bd0 kernel/exit.c:952
do_group_exit+0xd3/0x2a0 kernel/exit.c:1105
__do_sys_exit_group kernel/exit.c:1116 [inline]
__se_sys_exit_group kernel/exit.c:1114 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1114
x64_sys_call+0x1530/0x1730 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f880845a6c5
RSP: 002b:00007fff6abc2e38 EFLAGS: 00000202 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00007f880855bfe8 RCX: 00007f880845a6c5
RDX: 00000000000000e7 RSI: ffffffffffffff88 RDI: 0000000000000001
RBP: 0000000000000001 R08: 00007fff6abc2dc8 R09: 0000000000000000
R10: 00007fff6abc2c60 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f880855a680 R15: 00007f880855c000
task:syz.4.12635 state:R running task stack:23432 pid:10288 tgid:10285 ppid:5834 task_flags:0x400140 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6786
preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7109
irqentry_exit+0x36/0x90 kernel/entry/common.c:307
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lock_acquire+0x62/0x350 kernel/locking/lockdep.c:5875
Code: 55 37 12 83 f8 07 0f 87 bc 02 00 00 89 c0 48 0f a3 05 f2 b2 10 0f 0f 82 74 02 00 00 8b 35 da e4 10 0f 85 f6 0f 85 8d 00 00 00 <48> 8b 44 24 30 65 48 2b 05 89 55 37 12 0f 85 c7 02 00 00 48 83 c4
RSP: 0018:ffffc90003cee5b0 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffffffff8e5c4e00 RCX: 00000000343046e4
RDX: 0000000000000000 RSI: ffffffff8de0a75d RDI: ffffffff8c157260
RBP: 0000000000000002 R08: c3208215a8380e6f R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
class_rcu_constructor include/linux/rcupdate.h:1155 [inline]
unwind_next_frame+0xd1/0x20a0 arch/x86/kernel/unwind_orc.c:479
arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__do_kmalloc_node mm/slub.c:4328 [inline]
__kmalloc_node_track_caller_noprof+0x221/0x510 mm/slub.c:4347
__kmemdup_nul mm/util.c:63 [inline]
kstrdup+0x53/0x100 mm/util.c:83
kstrdup_const+0x63/0x80 mm/util.c:103
__kernfs_new_node+0x9b/0x8e0 fs/kernfs/dir.c:633
kernfs_new_node+0x13c/0x1e0 fs/kernfs/dir.c:713
__kernfs_create_file+0x53/0x350 fs/kernfs/file.c:1039
sysfs_add_file_mode_ns+0x207/0x3c0 fs/sysfs/file.c:319
create_files fs/sysfs/group.c:76 [inline]
internal_create_group+0x578/0xf30 fs/sysfs/group.c:183
internal_create_groups+0x9d/0x150 fs/sysfs/group.c:223
setup_gid_attrs drivers/infiniband/core/sysfs.c:1162 [inline]
ib_setup_port_attrs+0x41f/0x600 drivers/infiniband/core/sysfs.c:1439
add_one_compat_dev+0x558/0x7d0 drivers/infiniband/core/device.c:968
add_compat_devs drivers/infiniband/core/device.c:1026 [inline]
enable_device_and_get+0x336/0x3f0 drivers/infiniband/core/device.c:1337
ib_register_device drivers/infiniband/core/device.c:1450 [inline]
ib_register_device+0x87f/0xe00 drivers/infiniband/core/device.c:1396
rxe_register_device+0x275/0x320 drivers/infiniband/sw/rxe/rxe_verbs.c:1552
rxe_net_add+0x8e/0xe0 drivers/infiniband/sw/rxe/rxe_net.c:550
rxe_newlink+0x70/0x190 drivers/infiniband/sw/rxe/rxe.c:227
nldev_newlink+0x3a3/0x680 drivers/infiniband/core/nldev.c:1796
rdma_nl_rcv_msg+0x387/0x6e0 drivers/infiniband/core/netlink.c:195
rdma_nl_rcv_skb.constprop.0.isra.0+0x2d0/0x430 drivers/infiniband/core/netlink.c:239
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x58d/0x850 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg net/socket.c:727 [inline]
____sys_sendmsg+0xa95/0xc70 net/socket.c:2566
___sys_sendmsg+0x134/0x1d0 net/socket.c:2620
__sys_sendmsg+0x16d/0x220 net/socket.c:2652
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c6ff8e929
RSP: 002b:00007f7c70d17038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7c701b6080 RCX: 00007f7c6ff8e929
RDX: 0000000000004000 RSI: 0000200000000480 RDI: 0000000000000009
RBP: 00007f7c70010ca1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7c701b6080 R15: 00007ffd9dcec848
rcu: rcu_preempt kthread starved for 7586 jiffies! g207657 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt state:R running task stack:27784 pid:16 tgid:16 ppid:2 task_flags:0x208040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5397 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6786
__schedule_loop kernel/sched/core.c:6864 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6879
schedule_timeout+0x123/0x290 kernel/time/sleep_timeout.c:99
rcu_gp_fqs_loop+0x1ea/0xb00 kernel/rcu/tree.c:2054
rcu_gp_kthread+0x270/0x380 kernel/rcu/tree.c:2256
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.16.0-rc6-syzkaller-00121-g6832a9317eee #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:82
Code: 8b 6d 02 e9 83 fb 02 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 43 a9 23 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffffff8e207e08 EFLAGS: 000002c6
RAX: 00000000051e20e7 RBX: 0000000000000000 RCX: ffffffff8b866c99
RDX: 0000000000000000 RSI: ffffffff8de2f9f1 RDI: ffffffff8c157260
RBP: fffffbfff1c52ef0 R08: 0000000000000001 R09: ffffed1017086645
R10: ffff8880b843322b R11: 0000000000000001 R12: 0000000000000000
R13: ffffffff8e297780 R14: ffffffff90a93d50 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124722000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc321b454e8 CR3: 0000000078e5b000 CR4: 00000000003526f0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:749
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
rest_init+0x16b/0x2b0 init/main.c:745
start_kernel+0x3ee/0x4d0 init/main.c:1102
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x148